The invention discloses an axial-intake radial-exhaust casting volute structure, and is characterized in that the axial-intake radial-exhaust casting volute structure comprises a volute and a deflector ring; the deflector ring is positioned at the volute inlet and connected with an axial end surface of the volute; the upper half part and the lower half part of the volute are combined to a form a volute inner cavity; the cross section profile of the volute inner cavity in the axial direction is a vortex line or a log spiral line; the cross section profile of the volute inner cavity in a direction vertical to the axial direction is vortex lines or log spiral lines which are bilaterally symmetrical; the part of the deflector ring in the volute inner cavity forms an extended section of the profile of the volute inner cavity in the axial direction; and the position where the volute inner cavity and the deflector ring are connected and matched is provided with a surface with a fillet in transition with the profile. The casting volute structure is compact in structure and convenient to machine and install, and exhaust flow loss is little.